For all animals: oxygen.
A red blood cell drops off its load of oxygen at tissues in the body during the process of gas exchange. Oxygen is transported by red blood cells bound to hemoglobin and released when needed by the body's cells.
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Oxygen is the gas in the atmosphere that is important for respiration. It is needed by cells to generate energy through the process of cellular respiration.
Blood delivers oxygen to the cells through the red blood cells. These cells carry oxygen from the lungs to the different tissues in the body where it is needed for cellular respiration.
Hemoglobin is the molecule in red blood cells responsible for transporting oxygen from the lungs to the tissues in the body. It does this by binding to oxygen in the lungs and releasing it in areas of the body where it is needed for cellular respiration.
Nutrients are needed by body cells.
Nutrients are needed by body cells.
It is energy for our body's cells, that is broken down by the cells when energy is needed.
The blood carries oxygen to all the cells of the body.
FOOD
oxygen is needed
Needed substances are carried to the body's cells by RBC's, or red blood cells. Red blood cells contain hemoglobin, a substance that allows proteins to bond to them. However WBC's(white blood cells) provide the body's cells with much needed protection.
All living Cells need Catabolism and Anabolism collectively known as Metabolism
Blood
A red blood cell drops off its load of oxygen at tissues in the body during the process of gas exchange. Oxygen is transported by red blood cells bound to hemoglobin and released when needed by the body's cells.
Oxygen! Remember it isn't the only gas. CO2 is also removed from cells in the body.
In gas cans.